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Hemlock on the other hand contains five alkaloids - coniine, conhydrine, pseudoconhydrine, methyl-coniine and ethyl-piperidine - which cause violent vomiting and paralysis of the nervous system.

Its toxin, coniine, causes muscle paralysis and death.

Coniine will cause a slow creeping paralysis that moves through the body from the feet up and eventually stops the victim being able to breath.

Alkaloids are usually odorless; although nicotine, coniine, and a few others, have strong, characteristic odors.

Chemically, the toxic action of Hemlock depends on its alkaloids, "coniine," and "methyl-coniine."